← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 475 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 68 =
  2. 2.Half of 62 =
  3. 3.Double 37 =
  4. 4.Half of 46 =
  5. 5.Double 71 =
  6. 6.Half of 124 =
  7. 7.Half of 90 =
  8. 8.Double 74 =
  9. 9.Double 18 =
  10. 10.Half of 54 =
  11. 11.Double 51 =
  12. 12.Half of 140 =
  13. 13.Double 19 =
  14. 14.Half of 138 =
  15. 15.Half of 184 =
  16. 16.Half of 78 =
  17. 17.Double 61 =
  18. 18.Half of 64 =
  19. 19.Half of 152 =
  20. 20.Half of 150 =
  21. 21.Half of 80 =
  22. 22.Double 23 =
  23. 23.Double 91 =
  24. 24.Double 16 =
  25. 25.Double 59 =
  26. 26.Double 31 =
  27. 27.Double 82 =
  28. 28.Double 81 =
  29. 29.Half of 182 =
  30. 30.Half of 50 =
  31. 31.Double 72 =
  32. 32.Half of 70 =
  33. 33.Half of 168 =
  34. 34.Half of 162 =
  35. 35.Half of 112 =
  36. 36.Double 86 =
  37. 37.Half of 166 =
  38. 38.Double 26 =
  39. 39.Half of 188 =
  40. 40.Double 29 =

Answer key

  1. 34
  2. 31
  3. 74
  4. 23
  5. 142
  6. 62
  7. 45
  8. 148
  9. 36
  10. 27
  11. 102
  12. 70
  13. 38
  14. 69
  15. 92
  16. 39
  17. 122
  18. 32
  19. 76
  20. 75
  21. 40
  22. 46
  23. 182
  24. 32
  25. 118
  26. 62
  27. 164
  28. 162
  29. 91
  30. 25
  31. 144
  32. 35
  33. 84
  34. 81
  35. 56
  36. 172
  37. 83
  38. 52
  39. 94
  40. 58

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths